PAC's ANS-80 noise filter installs on your alternator output lead to suppress alternator whine (a noise that varies in pitch with engine RPM). This high-quality part is sealed for long-life. Two 10-gauge cables connect to your vehicle's alternator and battery. It's suitable for marine use. Warranty: 30 days.
TIP: Sometimes alternator whine can be cured just by topping off the fluid in your battery or properly grounding your in-dash stereo.